Skip to content

LangRef: Clarify behaviors of nsz in fast math flag #137567

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 3 commits into
base: main
Choose a base branch
from
Open

LangRef: Clarify behaviors of nsz in fast math flag #137567

Changes from 2 commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
a25d5dc
LangRef: Clarify nsz on min/max operations for +0.0 vs -0.0
wzssyqa Apr 28, 2025
918e5ac
Rewording
wzssyqa May 8, 2025
5fb5859
Merge branch 'main' into fmin
wzssyqa Sep 14, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
5 changes: 5 additions & 0 deletions llvm/docs/LangRef.rst
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -3914,6 +3914,11 @@ following flags to enable otherwise unsafe floating-point transformations.
No Signed Zeros - Allow optimizations to treat the sign of a zero
argument or zero result as insignificant. This does not imply that -0.0
is poison and/or guaranteed to not exist in the operation.
For fcmp, this has no effect. For min/max intrinsics, this allows
returning either +0 or -0 if both +0 and -0 are passed.
For calls to anything other than a min/max intrinsic,
arithmetic instructions, select, and phi, if the result is zero,
the returned value can be a zero of either sign.

Note: For :ref:`phi <i_phi>`, :ref:`select <i_select>`, and :ref:`call <i_call>`
instructions, the following return types are considered to be floating-point
Expand Down
Loading